Swift 4 错误：[<UIViewController 0x7ff66ec0ef30> setValue:forUndefinedKey:]：此类不符合键 emailField 的键值

Posted 2023-03-14

【中文标题】Swift 4 错误：[<UIViewController 0x7ff66ec0ef30> setValue:forUndefinedKey:]：此类不符合键 emailField 的键值编码

【英文标题】：Swift 4 error: [<UIViewController 0x7ff66ec0ef30> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key emailField

【发布时间】：2019-02-19 05:10:10

【问题描述】：

我尝试通过 IBOutlets 将 xib 文件中的几个对象链接到我的视图控制器代码，但是当我运行代码时出现错误

'NSUnknownKeyException'，原因：'[ setValue:forUndefinedKey:]：这个类不是键值 键 emailField 的编码兼容。'

我已经尝试删除所有插座并重新分配它们，并检查所有连接的对象每个都只有一个各自的插座。此外，当取消链接一个元素时，它的错误消失了，但对于不同的链接元素出现相同格式的错误。

import UIKit
import FirebaseAuth
import Firebase

class SignUpViewController: UIViewController 

    @IBOutlet weak var nameField: UITextField!
    @IBOutlet weak var usernameField: UITextField!
    @IBOutlet weak var emailField: UITextField!
    @IBOutlet weak var passField: UITextField!

    override func viewDidLoad() 
        super.viewDidLoad()

    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()

    

    @IBAction func toSignUp(_ sender: Any) 
        Auth.auth().createUser(withEmail: emailField.text!, password: passField.text!, completion: nil)
        Firestore.firestore().collection("users").document(usernameField.text!).setData([
            "name" : nameField.text!,
            "username" : usernameField.text!,
            "email" : emailField.text!
            ])

        TransitionModel().transitionModel(viewControllerName: "LoginViewController", newView: LoginViewController().view!, viewControllerCurrent: self)
    

    @IBAction func toLogin(_ sender: Any) 

        TransitionModel().transitionModel(viewControllerName: "LoginViewController", newView: LoginViewController().view!, viewControllerCurrent: self)

    



import UIKit
import Firebase

class LoginViewController: UIViewController 

    @IBOutlet weak var emailField: UITextField!
    @IBOutlet weak var passField: UITextField!

    override func viewDidLoad() 
        super.viewDidLoad()

    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()

    

    @IBAction func toLogin(_ sender: Any) 
    




import UIKit
import CoreData
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate 

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool 

            FirebaseApp.configure()

            self.window = UIWindow(frame: UIScreen.main.bounds)
            self.window?.rootViewController = UIViewController(nibName: "SignUpViewController", bundle: nil)
            self.window?.makeKeyAndVisible()

        return true
    

    func applicationWillResignActive(_ application: UIApplication) 
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    

    func applicationDidEnterBackground(_ application: UIApplication) 
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    

    func applicationWillEnterForeground(_ application: UIApplication) 
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    

    func applicationDidBecomeActive(_ application: UIApplication) 
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    

    func applicationWillTerminate(_ application: UIApplication) 
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
        // Saves changes in the application's managed object context before the application terminates.
        self.saveContext()
    

    // MARK: - Core Data stack

    lazy var persistentContainer: NSPersistentContainer = 
        /*
         The persistent container for the application. This implementation
         creates and returns a container, having loaded the store for the
         application to it. This property is optional since there are legitimate
         error conditions that could cause the creation of the store to fail.
        */
        let container = NSPersistentContainer(name: "Pono_Beta")
        container.loadPersistentStores(completionHandler:  (storeDescription, error) in
            if let error = error as NSError? 
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

                /*
                 Typical reasons for an error here include:
                 * The parent directory does not exist, cannot be created, or disallows writing.
                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                 * The device is out of space.
                 * The store could not be migrated to the current model version.
                 Check the error message to determine what the actual problem was.
                 */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            
        )
        return container
    ()

    // MARK: - Core Data Saving support

    func saveContext () 
        let context = persistentContainer.viewContext
        if context.hasChanges 
            do 
                try context.save()
             catch 
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            
        
    

提前感谢您的回复。

【参考方案1】：

当您只是复制粘贴视图控制器时会发生这种情况。

转到 Storyboard，选择 View Controller 打开连接检查器并删除 emailField 的连接并创建新的 Outlet

【讨论】：

谢谢，不过我试过了。它仍然给我一个新插座的错误。如果你想下载我的项目，我可以将它推送到 Git。

@EthanWilk 你已经创建了新鲜的故事板和 ViewController 或者你已经从你的一个项目中复制了请将代码添加到 git 我有时间会看看:)？

@EthanWilk- 将您的代码推送到 Git 存储库，将检查并更新。

@EthanWilk 检查 Git repo，它只有复制引用。

@EthanWilk 如果您使用的是 XIB，请确保您已将类指定为文件所有者